<template>
  <div>
  <div class="shopcart">
      <div class="content" @click="toggleList">
          <!-- 购物车左侧 -->
          <div class="content-left">
            <!-- 购物车图标 -->
            <div class="logo-wrapper">
                <div class="logo" :class="{'highlight':totalCount>0}">
                    <i class="icon-shopping_cart" :class="{'highlight':totalCount>0}"></i>
                </div>
                <!-- 购物车数量 -->
                <div class="num" v-show="totalCount>0">{{totalCount}}</div>
            </div>
            <!-- 配送费 -->
            <div class="price" :class="{'highlight':totalPrice>0}">￥{{totalPrice}}元</div>
            <div class="desc">另需餐桌费￥{{deliveryPrice}}元</div>
          </div>
          <!-- 购物车右侧 -->
          <div class="content-right" @click.stop="pay">
            <div class="pay" :class="payClass">
              {{payDesc}}
            </div>
          </div>
      </div>
      <!-- 添加到购物车时 小球飞入特效 -->
      <div class="ball-container">
      <transition-group name="drop" v-on:before-enter="beforeEnter" v-on:enter="enter" v-on:after-enter="afterEnter">
         <div class="ball" v-for="(ball,index) in balls" :key="'id'+index" v-show="ball.show">
           <div class="inner inner-hook"></div>
         </div>
      </transition-group>
      </div>
      <!-- 底部购物车展开列表 -->
      <transition name="fold">
        <div class="shopcart-list" v-show="listShow">
          <!-- 购物车标题 -->
          <div class="list-header">
            <h1 class="title">购物车</h1>
            <span class="empty" @click="empty">清空</span>
          </div>
          <!-- 列表 -->
          <div class="list-content" ref="listContent">
            <ul>
              <li class="food" v-for="(food,index) in selectFoods" :key="'key'+index">
                <span class="name">{{food.name}}</span>
                <div class="price">
                  <span>￥{{food.price*food.count}}</span>
                </div>
                <!-- 添加减少按钮组件 -->
                <div class="cartcontrol-wrapper">
                  <cartcontrol :food="food"></cartcontrol>
                </div>
              </li>
            </ul>
          </div>
        </div>
      </transition>
  </div>
  <!-- 购物车幕布 -->
  <transition name="fade">
    <div class="list-mark" @click="hideList" v-show="listShow"></div>
  </transition>
  <pay ref="pay" :select-foods="selectFoods" :support="support" :delivery-price="deliveryPrice"
    :min-price="minPrice" :delivery-time="deliveryTime" :total-price="totalPrice"></pay>
  </div>
</template>

<script>
import cartcontrol from 'components/cartcontrol/cartcontrol'
import pay from 'components/pay/pay'
import BScroll from 'better-scroll'
export default {
  data () {
    return {
      balls: [
        {show: false},
        {show: false},
        {show: false},
        {show: false},
        {show: false}
      ],
      dropBalls: [],
      fold: true,
      support: '' // 满减活动
    }
  },
  components: {
    cartcontrol,
    BScroll,
    pay
  },
  methods: {
    // 结算
    pay () {
      this.$refs.pay.show();
      if (this.totalPrice < this.minPrice) {
        return;
      }
      this.supports.forEach(element => {
        if (element.type === 1) {
          this.support = element.description;
        }
      });
    },
    // 隐藏购物车
    hideList () {
      this.fold = true;
    },
    // 清空购物车
    empty () {
      this.selectFoods.forEach((food) => {
        food.count = 0;
      });
    },
    // 显示隐藏列表
    toggleList () {
      if (!this.totalCount) {
        return;
      }
      this.fold = !this.fold;
    },
    // 小球飞入
    drop (el) {
      for (let i = 0; i < this.balls.length; i++) {
        let ball = this.balls[i];
        if (!ball.show) {
          ball.show = true;
          ball.el = el;
          this.dropBalls.push(ball);
          return;
        }
      }
    },
    beforeEnter (el) {
      let count = this.balls.length;
      while (count--) {
        let ball = this.balls[count];
        if (ball.show) {
          let rect = ball.el.getBoundingClientRect();
          let x = rect.left - 32;
          let y = -(window.innerHeight) - rect.top - 22;
          el.style.display = '';
          el.style.webkitTransform = `translate3d(0,${y}px, 0)`;
          el.style.transform = `translate3d(0,${y}px, 0)`;
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = `translate3d(${x}px, 0, 0)`;
          inner.style.transform = `translate3d(${x}px, 0, 0)`;
        }
      }
    },
    enter (el) {
      /* eslint-disable no-unused-vars */
      let rf = el.offsetHeight;
      this.$nextTick(() => {
          el.style.webkitTransform = 'translate3d(0, 0, 0)';
          el.style.transform = 'translate3d(0, 0, 0)';
          let inner = el.getElementsByClassName('inner-hook')[0];
          inner.style.webkitTransform = 'translate3d(0, 0, 0)';
          inner.style.transform = 'translate3d(0, 0, 0)';
      })
    },
    afterEnter (el) {
      let ball = this.dropBalls.shift();
      if (ball) {
        ball.show = false;
        el.style.display = 'none';
      }
    }
  },
  props: {
    // 已选中的商品数量和价格
    selectFoods: {
      type: Array,
      default () {
        return [
          {
            price: 0,
            count: 0
          }
        ];
      }
    },
    supports: {
      type: Array
    },
    // 配送费
    deliveryPrice: {
      type: Number,
      default: 0
    },
    deliveryTime: {
      type: Number,
      default: 0
    },
    // 最低起送价
    minPrice: {
      type: Number,
      default: 0
    }
  },
  computed: {
    // 价格总额
    totalPrice () {
      let total = 0;
      this.selectFoods.forEach((food) => {
        total += food.price * food.count;
      });
      return total;
    },
    // 商品数量
    totalCount () {
      let count = 0;
      this.selectFoods.forEach((food) => {
        count += food.count;
      });
      return count;
    },
    // 起送价
    payDesc () {
      if (this.totalPrice === 0) {
        return `￥${this.minPrice}元`;
      } else if (this.totalPrice < this.minPrice) {
        let diff = this.minPrice - this.totalPrice;
        return `还差￥${diff}元起送`;
      } else {
        return '去结算';
      }
    },
    // 付款按钮样式
    payClass () {
      if (this.totalPrice < this.minPrice) {
        return 'not-enough';
      } else {
        return 'enough';
      }
    },
    /* eslint-disable */
    listShow () {
      if (!this.totalCount) {
        this.fold = true;
        return false;
      }
      let show = !this.fold;
      if (show) {
        this.$nextTick(() => {
          if (!this.scroll) {
            this.scroll = new BScroll(this.$refs.listContent, {
            click: true
          });
          }else{
            this.scroll.refresh();
          }
        });
      }
      return show;
    }
    /* eslint-disable */
  }
}
</script>

<style lang='stylus' scoped>
 @import '../../common/stylus/mixin.styl'
  .shopcart
    position fixed
    left 0
    bottom 0
    z-index 50
    width 100%
    height 48px
    .content
      display flex
      background #141d27
      font-size 0
      color rgba(255, 255, 255, 0.4)
      .content-left
        flex 1
        .logo-wrapper
          display inline-block
          vertical-align top
          position relative
          top -10px
          margin 0 12px
          padding 6px
          width 56px
          height 56px
          box-sizing border-box
          border-radius 50%
          background #141d27
          .logo
            width 100%
            height 100%
            border-radius 50%
            background #2b343c
            text-align center
            &.highlight
              background rgb(0, 160, 220)
            .icon-shopping_cart
              font-size 24px
              line-height 44px
              color #80858a
              &.highlight
                color #fff
          .num
            position absolute
            top 0
            right 0
            width 24px
            height 16px
            line-height 16px
            text-align center
            border-radius 16px
            font-size 9px
            font-weight 700
            color #ffffff
            background rgb(240, 20, 20)
            box-shadow 0 4px 8px 0 rgba(0, 0, 0, .4)
        .price
          display inline-block
          vertical-align top
          margin-top 12px
          padding-right 12px
          line-height 24px
          box-sizing border-box
          border-right 1px solid rgba(255, 255, 255, 0.1)
          font-size 16px
          font-weight 700
          &.highlight
            color #fff
        .desc
          display inline-block
          vertical-align top
          margin 12px 0 0 12px
          line-height 24px
          font-size 10px
      .content-right
        flex 0 0 105px
        width 105px
        .pay
          height 48px
          line-height 48px
          text-align center
          font-size 12px
          font-weight 700
          background #2b333b
          &.not-enough
            background #2b333b
          &.enough
            background #00b43c
            color #fff

    .ball-container
      .ball
        position fixed
        left 32px
        bottom 22px
        z-index 200
        transition all 0.4s cubic-bezier(0.49, -0.29, 0.75, 0.41)
          .inner
            width 16px
            height 16px
            border-radius 50%
            background rgb(0, 160, 220)
            transition all 0.4s linear
    .shopcart-list
      position absolute
      left 0
      top 0
      z-index -1
      width 100%
      transition all 0.5s
      transform translate3d(0, -100%, 0)
      &.fold-enter, &.fold-leave-active
        transform translate3d(0, 0, 0)
      .list-header
        height 40px
        line-height 40px
        padding 0 18px
        background #f3f5f7
        border-bottom 1px solid rgba(7, 17, 27, 0.1)
        .title
          float left
          font-size 14px
          color rgb(7, 17, 27)
        .empty
          float right
          font-size 14px
          color rgb(0, 160, 210)
      .list-content
        padding 0 18px
        max-height 217px
        overflow hidden
        background #fff
        .food
          position relative
          padding 12px 0
          box-sizing border-box
          border-1px(rgba(7, 17, 27, 0.1))
          .name
            line-height 24px
            font-size 14px
            color rgb(7, 17, 27)
          .price
            position absolute
            right 90px
            top 12px
            line-height 24px
            font-size 14px
            font-weight 700
            color rgb(240, 20, 20)
          .cartcontrol-wrapper
            position absolute
            right 0
            bottom 6px
  .list-mark
    position fixed
    top 0
    left 0
    width 100%
    height 100%
    z-index 40
    backdrop-filter blur(10px)
    opacity 1
    background rgba(7, 17, 27, .6)
    transition all 0.5s
    &.fade-enter, &.fade-leave-active
      opacity 0
      background rgba(7, 17, 27, 0)
</style>
